cpi_interface.c

VC++视频开发实例集锦(包括“远程视频监控”"语音识别系统"等13个经典例子)

////////////////////////////////////////////////////////////////////////////////



#include "stdafx.h"
#include "globals.h"
#include "resource.h"
#include "WindowsOS.h"
#include "CPI_InterfacePart.h"



////////////////////////////////////////////////////////////////////////////////
// Handy macro to tidy up the source (handles the "SetHandler_xxxx" functions)
#define CPC_IMPLEMENT_SETHANDLER(handlertype)	\
void IF_sethandler_##handlertype(CP_HINTERFACE hInterface, wp_IF_##handlertype pfnHandler) {	\
	CPs_InterfaceWindowState* pState;														\
	pState = (CPs_InterfaceWindowState*)hInterface;											\
	CP_CHECKOBJECT(pState);																	\
	pState->m_hndlr_##handlertype = pfnHandler; }
//
////////////////////////////////////////////////////////////////////////////////




#define CPC_SIZEBORDER			0x4
////////////////////////////////////////////////////////////////////////////////
//
typedef struct _CPs_InterfaceWindowState
{
    HWND m_hWnd;
    DWORD m_dwStyle;
    SIZE m_szMinSize;

    // Windowpos
    POINT m_ptWindowPos;
    SIZE m_szWindowSize;

    // Window state
    BOOL m_bSkipRegion;
    BOOL m_bMouseLeaveEventSet;
    CPs_InterfacePart* m_pFloatActiveSubpart;
    CPs_InterfacePart* m_pActiveSubpart;

    // Callback handlers
    wp_IF_onCreate m_hndlr_onCreate;
    wp_IF_onDestroy m_hndlr_onDestroy;
    wp_IF_onPosChange m_hndlr_onPosChange;
    wp_IF_onDraw m_hndlr_onDraw;
    wp_IF_onKeyDown m_hndlr_onKeyDown;
    wp_IF_onDropFiles m_hndlr_onDropFiles;
    wp_IF_onFocus m_hndlr_onFocus;
    wp_IF_onAppMessage m_hndlr_onAppMessage;
    wp_IF_onCommandMessage m_hndlr_onCommandMessage;
    wp_IF_onClose m_hndlr_onClose;

    BOOL m_bMouseCaptured;
    wp_IF_onMouseMessage m_hndlr_onMouseMove;
    wp_IF_onMouseMessage m_hndlr_onMouseButton_LUp;

    // Subparts
    CPs_InterfacePart* m_pFirstSubPart;

} CPs_InterfaceWindowState;
//
////////////////////////////////////////////////////////////////////////////////


LRESULT CALLBACK exp_InterfaceWindowProc(HWND hWnd, UINT uiMessage, WPARAM wParam, LPARAM lParam);
void IF_PaintWindow(CPs_InterfaceWindowState* pState, CPs_DrawContext* pContext);
////////////////////////////////////////////////////////////////////////////////
//
//
//
CPC_IMPLEMENT_SETHANDLER(onCreate)
CPC_IMPLEMENT_SETHANDLER(onDestroy)
CPC_IMPLEMENT_SETHANDLER(onPosChange)
CPC_IMPLEMENT_SETHANDLER(onDraw)
CPC_IMPLEMENT_SETHANDLER(onKeyDown)
CPC_IMPLEMENT_SETHANDLER(onDropFiles)
CPC_IMPLEMENT_SETHANDLER(onFocus)
CPC_IMPLEMENT_SETHANDLER(onAppMessage)
CPC_IMPLEMENT_SETHANDLER(onCommandMessage)
CPC_IMPLEMENT_SETHANDLER(onClose)
//
//
//
HWND IF_GetHWnd(CP_HINTERFACE hInterface)
{
    CPs_InterfaceWindowState* pState;

    // Init
    pState = (CPs_InterfaceWindowState*)hInterface;
    CP_CHECKOBJECT(pState);

    return pState->m_hWnd;
}
//
//
//
void IF_ProcessInit()
{
    WNDCLASS wcPlaylist;
    wcPlaylist.style = 0L;
    wcPlaylist.lpfnWndProc = exp_InterfaceWindowProc;
    wcPlaylist.cbClsExtra = 0;
    wcPlaylist.cbWndExtra = 0;
    wcPlaylist.hInstance = GetModuleHandle(NULL);
    wcPlaylist.hIcon = NULL;	// We will explicity set our icons (so that we have a nice small icon)
    wcPlaylist.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcPlaylist.hbrBackground = (HBRUSH)GetStockObject(HOLLOW_BRUSH); // Prevent the system drawing white over our invaid rgn before we can paint
    wcPlaylist.lpszMenuName = NULL;
    wcPlaylist.lpszClassName = CLC_COOLPLAYER_INTERFACECLASSNAME;
    RegisterClass(&wcPlaylist);
}
//
//
//
void IF_ProcessDeInit()
{
    UnregisterClass(CLC_COOLPLAYER_INTERFACECLASSNAME, GetModuleHandle(NULL));
}
//
//
//
CP_HINTERFACE IF_Create(const char* pcTitle, const RECT* pInitialSize, const DWORD dwStyle)
{
    CPs_InterfaceWindowState* pState;

    pState = (CPs_InterfaceWindowState*)malloc(sizeof(*pState));
    memset(pState, 0, sizeof(*pState));

    return pState;
}
//
//
//
void IF_OpenWindow(CP_HINTERFACE hInterface, const char* pcTitle, const RECT* pInitialSize, const DWORD dwStyle)
{
    CPs_InterfaceWindowState* pState;

    // Init
    pState = (CPs_InterfaceWindowState*)hInterface;
    CP_CHECKOBJECT(pState);

    // Setup base state
    pState->m_dwStyle = dwStyle;
    pState->m_bSkipRegion = FALSE;

    // Create Windows window
    CreateWindowEx(WS_EX_ACCEPTFILES,
                   CLC_COOLPLAYER_INTERFACECLASSNAME,
                   pcTitle,
                   WS_POPUP | WS_CLIPCHILDREN | WS_SYSMENU
                   | ((dwStyle & CPC_INTERFACE_STYLE_RESIZING) ? WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_THICKFRAME : 0),
                   pInitialSize->left, pInitialSize->top,
                   pInitialSize->right - pInitialSize->left,
                   pInitialSize->bottom - pInitialSize->top,
                   NULL,
                   NULL,
                   GetModuleHandle(NULL),
                   pState);
}
//
//
//
void IF_CleanupState(CPs_InterfaceWindowState* pState)
{
    free(pState);
}
//
//
//
void IF_CloseWindow(CP_HINTERFACE hInterface)
{
    CPs_InterfaceWindowState* pState;

    // Init
    pState = (CPs_InterfaceWindowState*)hInterface;
    CP_CHECKOBJECT(pState);

    DestroyWindow(pState->m_hWnd);
}
//
//
//
void IF_SetVisible(CP_HINTERFACE hInterface, const BOOL bVisible)
{
    CPs_InterfaceWindowState* pState;

    // Init
    pState = (CPs_InterfaceWindowState*)hInterface;
    CP_CHECKOBJECT(pState);

    ShowWindow(pState->m_hWnd, bVisible ? SW_SHOW : SW_HIDE);
}
//
//
//
void IF_SetFloatActiveSubPart(CPs_InterfaceWindowState* pState, CPs_InterfacePart* pNewFloatActiveSubPart)
{
    // If this OS cannot give us mouseleave notification - do not do any float active stuff
    if(!pfnTrackMouseEvent)
        return;
    if(pState->m_pFloatActiveSubpart == pNewFloatActiveSubPart)
        return;

    // Set mouseleave event
    if(pState->m_bMouseLeaveEventSet == FALSE)
    {
        TRACKMOUSEEVENT tme;

        tme.cbSize = sizeof(tme);
        tme.dwFlags = TME_LEAVE;
        tme.hwndTrack = pState->m_hWnd;
        pState->m_bMouseLeaveEventSet = pfnTrackMouseEvent(&tme) ? TRUE : FALSE;
    }

    // Reset existing FA target
    if(pState->m_pFloatActiveSubpart)
    {
        if(pState->m_pFloatActiveSubpart->onMouseOut)
            pState->m_pFloatActiveSubpart->onMouseOut(pState->m_pFloatActiveSubpart);
    }

    // Set new FA target - do not set it if another target has buttondown
    if(pState->m_pActiveSubpart == NULL
            || pNewFloatActiveSubPart == NULL
            || pState->m_pActiveSubpart == pNewFloatActiveSubPart)
    {
        pState->m_pFloatActiveSubpart = pNewFloatActiveSubPart;
        if(pState->m_pFloatActiveSubpart)
        {
            if(pState->m_pFloatActiveSubpart->onMouseIn)
                pState->m_pFloatActiveSubpart->onMouseIn(pState->m_pFloatActiveSubpart);
        }
    }
}
//
//
//
CPs_InterfacePart* IF_HitTestMouse(CPs_InterfaceWindowState* pState, const POINT* pptMouse)
{
    CPs_InterfacePart* pSubPart_Cursor;

    // Walk through list drawing and adding to the valid rects list
    for(pSubPart_Cursor = pState->m_pFirstSubPart; pSubPart_Cursor; pSubPart_Cursor = (CPs_InterfacePart*)pSubPart_Cursor->m_hNext)
    {
        if(PtInRect(&pSubPart_Cursor->m_rLocation, *pptMouse) == TRUE)
        {
            return pSubPart_Cursor;
        }
    }

    return NULL;
}
//
//
//
LRESULT CALLBACK exp_InterfaceWindowProc(HWND hWnd, UINT uiMessage, WPARAM wParam, LPARAM lParam)
{
    CPs_InterfaceWindowState* pState;

    // Get the window's data object
    if(uiMessage == WM_NCCREATE)
    {
        HMODULE hModApplication;
        pState = (CPs_InterfaceWindowState*)((CREATESTRUCT*)lParam)->lpCreateParams;
        pState->m_hWnd = hWnd;
        SetWindowLong(hWnd, GWL_USERDATA, (LONG)pState);

        // Setup icons
        hModApplication = GetModuleHandle(NULL);
        SendMessage(hWnd, WM_SETICON, (WPARAM)ICON_BIG, (LPARAM)LoadIcon(hModApplication, MAKEINTRESOURCE(APP_ICON)));
        SendMessage(hWnd, WM_SETICON, (WPARAM)ICON_SMALL, (LPARAM)LoadIcon(hModApplication, MAKEINTRESOURCE(APP_ICON)));
    }
    else
        pState = (CPs_InterfaceWindowState*)GetWindowLong(hWnd, GWL_USERDATA);

    // We get some messages before the window gets it's WM_NCCREATE!!! (just how bad is Windows eh???)
    if(!pState)
        return DefWindowProc(hWnd, uiMessage, wParam, lParam);
    CP_CHECKOBJECT(pState);

    // Message handlers
    switch(uiMessage)
    {
    case WM_MOUSEMOVE:
        if(pState->m_bMouseCaptured)
        {
            if(pState->m_hndlr_onMouseMove)
                pState->m_hndlr_onMouseMove(pState, MAKEPOINTS(lParam), (SHORT)wParam);
        }
        else
        {
            CPs_InterfacePart* pHitSubPart;
            POINT ptMouse;
            ptMouse.x = (short)LOWORD(lParam);
            ptMouse.y = (short)HIWORD(lParam);

            pHitSubPart = IF_HitTestMouse(pState, &ptMouse);
            IF_SetFloatActiveSubPart(pState, pHitSubPart);
        }
        return 0;

    case WM_LBUTTONDOWN:
        {
            CPs_InterfacePart* pHitSubPart;
            POINT ptMouse;
            ptMouse.x = (short)LOWORD(lParam);
            ptMouse.y = (short)HIWORD(lParam);

            pHitSubPart = IF_HitTestMouse(pState, &ptMouse);
            if(pHitSubPart && pHitSubPart->onMouseButton_LDown)
            {
                SetCapture(pState->m_hWnd);
                pState->m_pActiveSubpart = pHitSubPart;
                pHitSubPart->onMouseButton_LDown(pHitSubPart, MAKEPOINTS(lParam));
            }
        }
        return 0;

    case WM_LBUTTONUP:
        if(pState->m_bMouseCaptured)
        {
            if(pState->m_hndlr_onMouseButton_LUp)
                pState->m_hndlr_onMouseButton_LUp(pState, MAKEPOINTS(lParam), (SHORT)wParam);
        }
        else
        {
            if(pState->m_pActiveSubpart)
            {
                ReleaseCapture();
                if(pState->m_pActiveSubpart->onMouseButton_LUp)
                    pState->m_pActiveSubpart->onMouseButton_LUp(pState->m_pActiveSubpart, MAKEPOINTS(lParam));
                pState->m_pActiveSubpart = NULL;
            }
        }
        return 0;

    case WM_NCDESTROY:
        IF_CleanupState(pState);
        break;

    case WM_CREATE:
        {
            const CREATESTRUCT* pCS = (const CREATESTRUCT*)lParam;

            // Update size/pos cache
            pState->m_ptWindowPos.x = pCS->x;
            pState->m_ptWindowPos.y = pCS->y;
            pState->m_szWindowSize.cx = pCS->cx;
            pState->m_szWindowSize.cy = pCS->cy;

            // Reposition any subitems
            IF_UpdateSubPartLayout(pState);

            // Callback
            if(pState->m_hndlr_onCreate)
            {
                RECT rInitialPos;

                rInitialPos.left = 0;
                rInitialPos.top = 0;
                rInitialPos.right = pCS->cx;
                rInitialPos.bottom = pCS->cy;
                pState->m_hndlr_onCreate(pState, &rInitialPos);
            }

            IF_RebuildRegion(pState);
        }
        return 0;

    case WM_DESTROY:
        if(pState->m_hndlr_onDestroy)
            pState->m_hndlr_onDestroy(pState);
        IF_RemoveAllSubparts(pState);
        break;

    case WM_NCHITTEST:
        {
            CPs_InterfacePart* pSubPart_Cursor;
            POINT ptMouse;
            ptMouse.x = (short)LOWORD(lParam) - pState->m_ptWindowPos.x;
            ptMouse.y = (short)HIWORD(lParam) - pState->m_ptWindowPos.y;

            // First perform hit testing on subparts
            for(pSubPart_Cursor = pState->m_pFirstSubPart; pSubPart_Cursor; pSubPart_Cursor = (CPs_InterfacePart*)pSubPart_Cursor->m_hNext)
            {
                if(PtInRect(&pSubPart_Cursor->m_rLocation, ptMouse) == TRUE)
                    return HTCLIENT;
            }

            // If the window is sizable - perform hit testing on edges
            if(pState->m_dwStyle & CPC_INTERFACE_STYLE_RESIZING)
            {
                // Is the mouse inside the size bands
                // - top band
                if(ptMouse.y < CPC_SIZEBORDER)
                {
                    // Are we in a corner
                    // - left
                    if(ptMouse.x < CPC_SIZEBORDER)
                        return HTTOPLEFT;
                    // - right
                    else if(ptMouse.x > (pState->m_szWindowSize.cx - CPC_SIZEBORDER) )
                        return HTTOPRIGHT;
                    else
                        return HTTOP;
                }
                // - bottom band
                else if(ptMouse.y > (pState->m_szWindowSize.cy - CPC_SIZEBORDER) )
                {
                    // Are we in a corner
                    // - left
                    if(ptMouse.x < CPC_SIZEBORDER)
                        return HTBOTTOMLEFT;
                    // - right
                    else if(ptMouse.x > (pState->m_szWindowSize.cx - CPC_SIZEBORDER) )
                        return HTBOTTOMRIGHT;
                    else
                        return HTBOTTOM;
                }
                // - left band
                else if(ptMouse.x < CPC_SIZEBORDER)
                    return HTLEFT;
                // - right band
                else if(ptMouse.x > (pState->m_szWindowSize.cx - CPC_SIZEBORDER) )
                    return HTRIGHT;
            }

            // - return the caption so that the window is dragged
            return HTCAPTION;
        }

    case WM_WINDOWPOSCHANGED:
        {
            const WINDOWPOS* pWP = (const WINDOWPOS*)lParam;
            RECT rNewPos;